Index: llvm/lib/Target/AMDGPU/AMDGPUPropagateAttributes.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/AMDGPUPropagateAttributes.cpp
+++ llvm/lib/Target/AMDGPU/AMDGPUPropagateAttributes.cpp
@@ -53,12 +53,6 @@
   AMDGPU::FeatureWavefrontSize64
 };
 
-// Attributes to propagate.
-// TODO: Support conservative min/max merging instead of cloning.
-static constexpr const char *AttributeNames[] = {"amdgpu-waves-per-eu"};
-
-static constexpr unsigned NumAttr = std::size(AttributeNames);
-
 class AMDGPUPropagateAttributes {
 
   class FnProperties {
@@ -68,30 +62,20 @@
   public:
     explicit FnProperties(const TargetMachine &TM, const Function &F) {
       Features = TM.getSubtargetImpl(F)->getFeatureBits();
-
-      for (unsigned I = 0; I < NumAttr; ++I)
-        if (F.hasFnAttribute(AttributeNames[I]))
-          Attributes[I] = F.getFnAttribute(AttributeNames[I]);
     }
 
     bool operator == (const FnProperties &Other) const {
       if ((Features & TargetFeatures) != (Other.Features & TargetFeatures))
         return false;
-      for (unsigned I = 0; I < NumAttr; ++I)
-        if (Attributes[I] != Other.Attributes[I])
-          return false;
       return true;
     }
 
     FnProperties adjustToCaller(const FnProperties &CallerProps) const {
       FnProperties New((Features & ~TargetFeatures) | CallerProps.Features);
-      for (unsigned I = 0; I < NumAttr; ++I)
-        New.Attributes[I] = CallerProps.Attributes[I];
       return New;
     }
 
     FeatureBitset Features;
-    std::optional<Attribute> Attributes[NumAttr];
   };
 
   class Clone {
@@ -126,10 +110,6 @@
   // Set new function's features in place.
   void setFeatures(Function &F, const FeatureBitset &NewFeatures);
 
-  // Set new function's attributes in place.
-  void setAttributes(Function &F,
-                     const ArrayRef<std::optional<Attribute>> NewAttrs);
-
   std::string getFeatureString(const FeatureBitset &Features) const;
 
   // Propagate attributes from Roots.
@@ -274,7 +254,6 @@
             // we rely on a second pass running on Module, which is allowed
             // to clone.
             setFeatures(F, NewProps.Features);
-            setAttributes(F, NewProps.Attributes);
             NewRoots.insert(&F);
             Changed = true;
             break;
@@ -317,7 +296,6 @@
   ValueToValueMapTy dummy;
   Function *NewF = CloneFunction(&F, dummy);
   setFeatures(*NewF, NewProps.Features);
-  setAttributes(*NewF, NewProps.Attributes);
   NewF->setVisibility(GlobalValue::DefaultVisibility);
   NewF->setLinkage(GlobalValue::InternalLinkage);
 
@@ -344,18 +322,6 @@
   F.addFnAttr("target-features", NewFeatureStr);
 }
 
-void AMDGPUPropagateAttributes::setAttributes(
-    Function &F, const ArrayRef<std::optional<Attribute>> NewAttrs) {
-  LLVM_DEBUG(dbgs() << "Set attributes on " << F.getName() << ":\n");
-  for (unsigned I = 0; I < NumAttr; ++I) {
-    F.removeFnAttr(AttributeNames[I]);
-    if (NewAttrs[I]) {
-      LLVM_DEBUG(dbgs() << '\t' << NewAttrs[I]->getAsString() << '\n');
-      F.addFnAttr(*NewAttrs[I]);
-    }
-  }
-}
-
 std::string
 AMDGPUPropagateAttributes::getFeatureString(const FeatureBitset &Features) const
 {
Index: llvm/test/CodeGen/AMDGPU/propagate-attributes-clone.ll
===================================================================
--- llvm/test/CodeGen/AMDGPU/propagate-attributes-clone.ll
+++ llvm/test/CodeGen/AMDGPU/propagate-attributes-clone.ll
@@ -58,11 +58,11 @@
 ; OPT-INT: define internal fastcc void @foo3() unnamed_addr #4
 ; OPT-EXT: define internal fastcc void @foo2.3() unnamed_addr #4
 ; OPT-INT: define internal fastcc void @foo2() unnamed_addr #4
-; OPT: attributes #0 = { {{.*}} "amdgpu-waves-per-eu"="1,1" "target-features"="+wavefrontsize64" }
+; OPT: attributes #0 = { {{.*}} "target-features"="+wavefrontsize64" }
 ; OPT: attributes #1 = { {{.*}} "target-features"="{{.*}},-wavefrontsize16,-wavefrontsize32,+wavefrontsize64{{.*}}" }
-; OPT: attributes #2 = { {{.*}} "amdgpu-waves-per-eu"="2,4" "target-features"="+wavefrontsize32" }
+; OPT: attributes #2 = { {{.*}} "target-features"="+wavefrontsize32" }
 ; OPT: attributes #3 = { {{.*}} "target-features"="+wavefrontsize64" }
-; OPT: attributes #4 = { {{.*}} "amdgpu-waves-per-eu"="2,4" "target-features"="{{.*}},-wavefrontsize16,+wavefrontsize32,-wavefrontsize64{{.*}}" }
+; OPT: attributes #4 = { {{.*}} "target-features"="{{.*}},-wavefrontsize16,+wavefrontsize32,-wavefrontsize64{{.*}}" }
 
 ; LLC: foo3:
 ; LLC: sample asm
@@ -138,8 +138,8 @@
   ret void
 }
 
-attributes #0 = { nounwind "target-features"="+wavefrontsize32" "amdgpu-waves-per-eu"="2,4" }
-attributes #1 = { noinline nounwind "target-features"="+wavefrontsize64" "amdgpu-waves-per-eu"="1,1" }
+attributes #0 = { nounwind "target-features"="+wavefrontsize32" }
+attributes #1 = { noinline nounwind "target-features"="+wavefrontsize64" }
 attributes #2 = { nounwind "target-features"="+wavefrontsize64" }
 attributes #3 = { nounwind "target-features"="+wavefrontsize64" }
-attributes #4 = { noinline nounwind "target-features"="+wavefrontsize64" "amdgpu-waves-per-eu"="2,4" }
+attributes #4 = { noinline nounwind "target-features"="+wavefrontsize64" }
Index: llvm/test/CodeGen/AMDGPU/propagate-attributes-function-pointer-argument.ll
===================================================================
--- llvm/test/CodeGen/AMDGPU/propagate-attributes-function-pointer-argument.ll
+++ llvm/test/CodeGen/AMDGPU/propagate-attributes-function-pointer-argument.ll
@@ -37,4 +37,4 @@
 }
 
 attributes #0 = { noinline }
-attributes #1 = { noinline "amdgpu-waves-per-eu"="1,10" }
+attributes #1 = { noinline "target-features"="+wavefrontsize32" }